How to use \t in c language

Pointer is a data type in C language that points to the address of a variable. The following functions can be achieved using pointers: declare pointer: int *ptr; allocate memory: ptr = (int *) malloc(sizeof(int)); dereference pointer: *ptr = 10; get address (&): return variable address; Dereference (*): access the variable pointed by the pointer; addition ( )/subtraction (-): move the pointer position.

How to use pointers in C language

The pointer is an advanced data type in C language. It uses To store the address of another variable. Using pointers allows for more efficient memory management, dynamic allocation and dereferencing.

How to use pointers

1. Declare pointers:

   <code class="c">int *ptr;</code>

This A pointer ptr pointing to a variable of type int is declared.

2. Allocate memory:

   <code class="c">ptr = (int *) malloc(sizeof(int));</code>

This uses the malloc function to dynamically allocate the size of sizeof(int) of memory and returns a pointer to the allocated memory.

3. Dereference pointer:

   <code class="c">*ptr = 10;</code>

This will store 10 in the memory pointed to by ptr middle.

Pointer arithmetic

• Get address (&): Return the address of the variable.
• Dereference (*): Access the variable pointed to by the pointer.
• Addition ( ): Move the pointer forward one element.
• Subtraction (-): Move the pointer backward one element.

Pointer array

Pointer array stores pointers of the same data type. Each element points to a separate variable.

<code class="c">int *arr[3];</code>

This declares an array arr of three int pointers.

Purpose of pointers

• Dynamic memory allocation: Allows the program to allocate and release memory at runtime.
• Passing function parameters: You can pass pointers to functions to avoid copying large data structures.
• Pointing to a function: You can point a pointer to a function to implement a function pointer.
• Linked lists and trees: Pointers are used to link elements in a data structure to each other.
• String processing: Pointers are used to traverse and operate strings.

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